Furnace.



F. & A. GIRTANNER. FURNACE.

APPLICATION FILED JULYE, 1912. 1,102,041. Patented June 30,1914.

2 SHEETS-SHEET 2.

23 3 Flg llll i the combustion chamber 15 FREDERICK GIBTANNEB AND ALEXANDER GIRTANNEB, OF ST. LOUIS, MISSOURI.

summon.

Specification of Letters Patent.

Patented June 30, 1914.

Application filed July 5, 1912. Serial No. 707,928.

To all whom it may concern Beit known that we, FREDERICK GIRTAN- NER and ALEXANDER GIRTANNER, citizens of the United States of America, residing at the city of St. Louis, State of Missouri, have invented a certain new and useful Furnace, of which the following is such a full, clear, and exact description as will enable any one skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, forming part of this specificatlon.

Our invent-ion relates to furnaces and more particularly to furnaces such as are adapted to be used in connection with steam boilers.

. In the accompanying drawings, which illustrate one form of furnace made in accordance with our invention, Figure 1 is a vertical longitudinal section taken on the line 11 of Fig. 6; Fig. 2 is an enlarged sectional view showing the furnace door; Fig. 3 is an enlarged section of one of the dumping plates; Fig. 4 is an enlarged sectional view of one of the rocking grate bars; Fig. 5 is an enlarged elevation of one of the fixed grate bars; and Fig. 6 is a horizontal section on a slightly enlarged'scale taken on the line 66 of Fig. 1.

Like marks of reference refer to similar parts in the several views of the drawings.

10 represents the front wall of the fur nace, 11 the side walls and 12 the bottom wall. The front wall 10 is covered by the usual iron front 13. Above the bottom wall 12 isthe ash bed 14 which is se arated from the furnace by a set of fixed grate bars 16, one of which is shown in detail in Fig. 5. These grate bars 16 are arranged in pairs as best shown in Fig. 6.- The two bars of each pair are similar except that they are what may be termed right and left hand bars. The bars 16 are supported at their forward end by means of a cross plate 17 set into the front wall 10 of the furnace. From the cross plate 17, the bars extend rearwardly and downwardly at an inclination of preferably about thirty degrees and are supported at their rear ends by a Y"bar 18. The bars16 are provided with lugs 20 which space them a slight distance apart so as to leave air spaces 21 and they are also supplied with indentations which form rectangular openings 22 adapted to receive rocking grate bars. Adjacent to each of the rectangular openings 22, the fixed grate bars 16 are provided with slots 23 which form sockets for receiving the trunnions -24 of the rocking grate bars 25. Each of the rocking grate bars is provided with a central air passage 26 and with a downwardly projecting arm 27. These arms 27 are bifurcated at their lower ends so as to receive laterally extending rods 28 to which they are secured by means of cotter pins 29, or in any other suitable manner. The bars 28 are carried in yokes 30 pivoted by bolts 31 to links 32. The links 32 connect the yokes 30 with short bent levers, the upper ends 34 of which are adapted to be engaged by means of a removable handle 35, as shown in Fig. 1, so as to operate the rocking grate bars 25 as will be hereinafter more fully described. The levers 33 are carried in a bracket 36 secured to a front plate 13 of the furnace.

38 are brackets which are secured at their front ends to the Y bar 18 and at their rear ends to the bridge wall 39 of the furnace. These brackets 38 are provided with slots 40 adapted to receive trunnions 41 on the dumping plates 42 which are preferably two in number. The dumping plates 42 are best shown in Fig. 3. They are provided with upwardly extending portions 43 arranged at the rear of their trunnions 41. These upwardly extending portions 43 are protected by means of an overhanging por tion 44 of the bridge wall 39 and serves to break loose any clinkers which may adhere to the bridge wall. The dumping plates 42 are provided with a number of openings 45 for the passage of ash. These openings 45 are tapered from the top to the bottom so that anything entering the openings will not remain therein but will drop through and thus not obstruct the openings. Each of the dumping plates 42 is provided with a downwardly projecting arm 46 connected by means of a link 47 with a lever 48 carried by a bracket 36 hereinbefore referred to. By operating levers 48, the dumping plates may be actuated as will be hereinafter described.

Arranged at the rear of the front wall 10 are a pair of arches 50 and 51, respectively, which are arranged at a considerable distance above the grate and the bridge wall. Intermediate to these arches 50 and 51 is a third arch 52 which extends downwardly between the two arches so as to force the air and products of combustion which enter the combustion chamber to pass downwardly v over the grate before passing upwardly over the bridge wall. Each of the furnace doors 53 is provided with two sets of tapered air pipes 54 and 55 respectively. The air pipes 54 are arranged so as to discharge the air int-o the furnace in a substantially horizontal direction so as to strike against the downwardly projecting arch 52, while the set of pipes 55 are so arranged as to discharge the air downwardly and rearwardly in an inclined direction so as to pass over the fuel contained on the grate and to pass under the arch 52. In order to regulate the flow of air through the pipes 54 and 55, we pivot to the'door 53 a screen or valve 56 which has pivoted to it a rack bar 57 by means of which it may be adjusted toward or away from the door thus controlling the supply of air. I

The operation of our furnace is as follows: After the dumping plates 42 have become filled with ash and clinkers, the levers 48 are operated so as to drop the forward ends of the plate and discharge the contents thereon into theash pit 14. The upwardly extending rear portion 43 of the plates will break away any clinkers which may adhere to the bridge wall. The overhanging portion 44 of the bridge wall prevents the clinkers from assuming a position which would interfere with the operation of the dumping plate. After the ashes and clinkers have been discharged from the dumping plates 42, the plates are again 'moved into their normal position and one of the levers 33 is operated by means of the handle 35 so as to actuate the rear set of rocking grate bars 25. These grate bars 25 act as knives to remove any clinkers from the stationary grate bars and, at the same time, discharge the nearly consumed fuel contained thereon Onto the dumping plates 42. After these rear rocking bars 25 have assumed their normal position, another of the levers 33 is actuated so as to operate the intermediate set of rocking bars 25 and thus discharge the partially coked coal contained there-on onto the rear set of rocking bars 25. After the intermediate bars have resumed their former position, the forward set of bars are operated so as to discharge the nearly fresh fuel contained thereon onto the intermediate bars. After the front bars have resumed their normal position, the door 53 may be opened so as to allow the placing of a fresh charge of fuel on the forward grate bars 25. In this manner, the gradual feeding of the fuel along the grate bars is accomplished and this together with the disposition of the arches and bridge Wall secures perfect combustion of the fuel, thus not only economizing fuel but preventing the formation of smoke. These results are greatly facilitated by the control of the flow of air into the combustion chamber which is secured by means of the tapered pipes 54 and 55, the flow of air through which pipes is controlled by means of a screen or valve 56. 0

Having fully described our invention, what we claim as new and desire to secure by Letters Patent of the United States is:

1. In a boiler furnace, the combination with a set of fixed grate bars, each of said bars being provided with deep and shallow recesses, the shallow recess of each bar cooperating with similar recesses of adjacent bars to form air passages and the deep recess of each bar coiiperatin with similar recesses in adjacent bars to form openings to receive rocking grate -bars.

2. Ina boiler furnace, the combination with a set of fixed grate bars, each of said bars being provided with deep and shallow recesses, the shallow recess of each bar cooperating with similar recesses on adjacent bars to orm air passages and the deep recess of each bar coiiperating with similar recesses in adjacent bars to form openings to receive rocking grate bars, and rocking grate bars provided with central air passages arranged in said openings.

In testimony whereof, we have hereunto Witnesses as to Frederick Girtanner:

W. A. ALEXANDER, G. M. SHORE.

Witnesses as to Alexander Girtanner:

F. D. GovAN, OSCAR BOOKSDALEl 

